{"common":{"save":0,"post_id":"954","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"71","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='img\/2.jpg' \/><\/center>Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang c\u1ee7a ph\u00e9p to\u00e1n $\\dfrac{-2}{3} + \\dfrac{-3}{4} $ ","select":["A. $\\dfrac{1}{7}$","B. $\\dfrac{-17}{12}$","C. $\\dfrac{-5}{7}$","D. $\\dfrac{-1}{12}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{-2}{3} + \\dfrac{-3}{4} $$ = \\dfrac{-8}{12} + \\dfrac{-9}{12} $$ = \\dfrac{(-8)+(-9)}{12} $$ = \\dfrac{-17}{12}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"72","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='img\/10.jpg' \/><\/center>Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang c\u1ee7a ph\u00e9p to\u00e1n $\\dfrac{-5}{12} + 0,75 $ ","select":["A. $\\dfrac{1}{3}$","B. $\\dfrac{-1}{3}$","C. $\\dfrac{2}{3}$","D. $\\dfrac{-2}{3}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\dfrac{-5}{12} + 0,75 $$ = \\dfrac{-5}{12} + \\dfrac{75}{100} = \\dfrac{-5}{12} + \\dfrac{3}{4} $$= \\dfrac{-5}{12} + \\dfrac{9}{12} = \\dfrac{(-5)+ 9}{12} $$ = \\dfrac{4}{12} = \\dfrac{1}{3}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"73","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='img\/10.jpg' \/><\/center>Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang c\u1ee7a ph\u00e9p to\u00e1n $-4 - \\dfrac{-4}{5} $ ","select":["A. $-2\\dfrac{1}{5}$","B. $-3\\dfrac{1}{5}$","C. $-4\\dfrac{1}{5}$","D. $-5\\dfrac{1}{5}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b><br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $-4 - \\dfrac{-4}{5} $$ = \\dfrac{-20}{5} - \\dfrac{-4}{5} $$ = \\dfrac{-16}{5} $$ = -3\\dfrac{1}{5}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"74","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-5"],["21"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center> Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ \\dfrac{3}{7} + \\dfrac{-2}{3} $= <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> (Nh\u1eadp ph\u00e2n s\u1ed1 \u1edf d\u1ea1ng t\u1ed1i gi\u1ea3n)","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b><br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{3}{7} + \\dfrac{-2}{3} $$ = \\dfrac{9}{21} + \\dfrac{-14}{21} $$ = \\dfrac{-5}{21}$ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 ph\u00e9p t\u00ednh l\u00e0 $\\dfrac{-5}{21}.$<\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"75","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["17"],["6"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center> Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ 0,5 + 2\\dfrac{1}{3} $=<div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> (Nh\u1eadp ph\u00e2n s\u1ed1 \u1edf d\u1ea1ng t\u1ed1i gi\u1ea3n)","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $0,5 + 2\\dfrac{1}{3} $$ = \\dfrac{5}{10} + \\dfrac{7}{3} $$ = \\dfrac{15}{30} + \\dfrac{70}{30} $$ = \\dfrac{85}{30} $$ = \\dfrac{17}{6}$ <br\/> <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 ph\u00e9p t\u00ednh l\u00e0 $\\dfrac{17}{6}.$<\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"76","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"],["20"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center>Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ \\dfrac{11}{12} - \\dfrac{2}{3} - \\dfrac{1}{5} $= <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> (Nh\u1eadp ph\u00e2n s\u1ed1 \u1edf d\u1ea1ng t\u1ed1i gi\u1ea3n)","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b><br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{11}{12} - \\dfrac{2}{3} - \\dfrac{1}{5} $$ = \\dfrac{55}{60} - \\dfrac{40}{60} - \\dfrac{12}{60} $$ = \\dfrac{3}{60} $$ = \\dfrac{1}{20}$ <br\/> <br\/> <span class='basic_pink'> V\u1eady c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng ph\u00e2n s\u1ed1 $\\dfrac{1}{20}$<\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"77","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"<center><img src='img\/10.jpg' \/><\/center>Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang c\u1ee7a bi\u1ec3u th\u1ee9c $ M = \\dfrac{2}{5} + \\dfrac{-4}{3} + \\dfrac{-1}{2} $ ","select":["A. $-1\\dfrac{4}{30}$","B. $1\\dfrac{4}{30}$","C. $-1\\dfrac{13}{30}$","D. $1\\dfrac{13}{30}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $M = \\dfrac{2}{5} + \\dfrac{-4}{3} + \\dfrac{-1}{2} $$ = \\dfrac{12}{30} + \\dfrac{-40}{30} + \\dfrac{-15}{30} $$ = \\dfrac{-43}{30} $$ = -1\\dfrac{13}{30}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"78","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"<center><img src='img\/10.jpg' \/><\/center>Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang c\u1ee7a bi\u1ec3u th\u1ee9c $ M = 5 - \\dfrac{2}{5} + \\dfrac{1}{7} $ ","select":["A. $2\\dfrac{26}{35}$","B. $3\\dfrac{26}{35}$","C. $4\\dfrac{26}{35}$","D. $5\\dfrac{26}{35}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $M = 5 - \\dfrac{2}{5} + \\dfrac{1}{7} $$ = \\dfrac{175}{35} - \\dfrac{14}{35} + \\dfrac{5}{35} $$ = \\dfrac{166}{35} $$ = 4\\dfrac{26}{35}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"79","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" T\u00ecm $x \\in \\mathbb{Q}$ bi\u1ebft: $ x + \\dfrac{1}{2} = \\dfrac{1}{3} - \\dfrac{-1}{4} $ ","select":["A. $x = \\dfrac{-5}{12}$","B. $x = \\dfrac{1}{12}$","C. $x = \\dfrac{3}{12}$","D. $x = \\dfrac{5}{12}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> - Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a x sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> - Thu g\u1ecdn v\u00e0 t\u00ecm x. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $x + \\dfrac{1}{2} = \\dfrac{1}{3} - \\dfrac{-1}{4} $ <br\/> $ \\Rightarrow x + \\dfrac{1}{2} = \\dfrac{7}{12}$ <br\/> $ \\Rightarrow x= \\dfrac{7}{12} - \\dfrac{1}{2} $ <br\/> $ \\Rightarrow x = \\dfrac{1}{12}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"80","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" T\u00ecm $x \\in \\mathbb{Q}$ bi\u1ebft: $ \\dfrac{7}{6} - x + \\dfrac{-13}{2} = \\dfrac{-19}{3} $ ","select":["A. $x = \\dfrac{13}{6}$","B. $x = \\dfrac{4}{3}$","C. $x = -4$","D. $x = 1$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> - Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a x sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> - Thu g\u1ecdn v\u00e0 t\u00ecm x. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{7}{6} - x + \\dfrac{-13}{2} = \\dfrac{-19}{3} $ <br\/> $ \\Rightarrow \\dfrac{7}{6} - x = \\dfrac{13}{2} + \\dfrac{-19}{3} $ <br\/>$ \\Rightarrow \\dfrac{7}{6} - x = \\dfrac{1}{6} $<br\/> $ \\Rightarrow x = \\dfrac{7}{6} - \\dfrac{1}{6} $<br\/> $ \\Rightarrow x = 1$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"81","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" T\u00ecm $x \\in \\mathbb{Q}$ bi\u1ebft: $ \\dfrac{10}{3} + x = -5 $ ","select":["A. $ x = \\dfrac{5}{3}$","B. $x = \\dfrac{-5}{3}$","C. $x = \\dfrac{-25}{3}$","D. $ x = -5 $"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> - Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a x sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> - Thu g\u1ecdn v\u00e0 t\u00ecm x. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{10}{3} + x = -5 $ <br\/> $ \\Rightarrow x = -5 - \\dfrac{10}{3} $ <br\/> $ \\Rightarrow x = \\dfrac{-25}{3}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"82","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["121"],["15"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" T\u00ecm x bi\u1ebft $ x - \\dfrac{12}{5} = \\dfrac{17}{3} $ <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $x$ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> - Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a x sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> - Thu g\u1ecdn v\u00e0 t\u00ecm x. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $x - \\dfrac{12}{5} = \\dfrac{17}{3} $ <br\/> $ \\Rightarrow x = \\dfrac{17}{3} + \\dfrac{12}{5} $<br\/> $ \\Rightarrow x = \\dfrac{121}{15}$ <br\/> <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a x l\u00e0 $\\dfrac{121}{15}.$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:42"},{"id":"83","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-13"],["2"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"T\u00ecm x bi\u1ebft $ 7 + x = \\dfrac{1}{2} $ <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> $x $= <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u00e0i to\u00e1n t\u00ecm x <\/b> <br\/> - Chuy\u1ec3n c\u00e1c h\u1ea1ng t\u1eed ch\u1ee9a x sang m\u1ed9t v\u1ebf, c\u00e1c h\u1eb1ng s\u1ed1 sang v\u1ebf kia. <br\/> - Thu g\u1ecdn v\u00e0 t\u00ecm x. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $7 + x = \\dfrac{1}{2} $ <br\/> $ \\Rightarrow x = \\dfrac{1}{2} - 7 $<br\/> $ \\Rightarrow x = \\dfrac{-13}{2}$ <br\/> <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a x l\u00e0 $\\dfrac{-13}{2}.$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"84","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center> Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ A = - \\left( \\dfrac{11}{14} - \\dfrac{8}{19} \\right) + \\left( \\dfrac{-3}{14} - \\dfrac{8}{19} \\right) $ = _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> B\u1ecf d\u1ea5u ngo\u1eb7c r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. <br\/> <br\/> $A = - \\left( \\dfrac{11}{14} - \\dfrac{8}{19} \\right) + \\left( \\dfrac{-3}{14} - \\dfrac{8}{19} \\right) $$ = -\\dfrac{11}{14} + \\dfrac{8}{19} - \\dfrac{3}{14} - \\dfrac{8}{19} $$ = \\left( \\dfrac{-11}{14} - \\dfrac{3}{14} \\right) + \\left( \\dfrac{8}{19} - \\dfrac{8}{19} \\right) $$ = \\dfrac{-14}{14} $$ = -1 $<br\/> <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a A l\u00e0 $-1.$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"85","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["21"],["40"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center>Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ B = 0,75 - 0,6 + \\dfrac{3}{8} $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> <br\/> $ B = 0,75 - 0,6 + \\dfrac{3}{8} $$ = \\dfrac{75}{100} - \\dfrac{6}{10} + \\dfrac{3}{8} $$ = \\dfrac{3}{4} - \\dfrac{3}{5} + \\dfrac{3}{8} $$ =\\dfrac{30}{40} - \\dfrac{24}{40} + \\dfrac{15}{40} $$ = \\dfrac{21}{40}$<br\/> <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a B l\u00e0 $\\dfrac{21}{40}$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"86","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["53"],["60"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center>Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ C = 2,75 - 2,2 + \\dfrac{1}{3} $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $ C = 2,75 - 2,2 + \\dfrac{1}{3} $$ = \\dfrac{275}{100} - \\dfrac{22}{10} + \\dfrac{1}{3} $$ = \\dfrac{11}{4} - \\dfrac{11}{5} + \\dfrac{1}{3} $$ = \\left( \\dfrac{55}{20} - \\dfrac{44}{20} \\right) + \\dfrac{1}{3} $$ = \\dfrac{11}{20} + \\dfrac{1}{3} = \\dfrac{33}{60} + \\dfrac{20}{60} $$ = \\dfrac{53}{60}$<br\/> <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a C l\u00e0 $\\dfrac{53}{60}$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"87","post_id":"954","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" S\u1ed1 h\u1eefu t\u1ec9 $\\dfrac{-5}{16}$ vi\u1ebft th\u00e0nh t\u1ed5ng c\u1ee7a hai s\u1ed1 h\u1eefu t\u1ec9 \u00e2m n\u00e0o d\u01b0\u1edbi \u0111\u00e2y? ","select":["A. $\\dfrac{-1}{16} + \\dfrac{1}{4}$","B. $\\dfrac{-1}{16} + \\dfrac{-3}{16}$","C. $\\dfrac{-1}{16} + \\dfrac{1}{-4} $","D. $ \\dfrac{-1}{16} + \\dfrac{4}{16}$"],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9: <\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{-5}{16} = \\dfrac{-1}{16} + \\dfrac{-4}{16} = \\dfrac{-1}{16} + \\dfrac{-1}{4} = \\dfrac{-1}{16}+ \\dfrac{1}{-4}$<br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> <br\/>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"88","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["8"]]],"list":[{"point":5,"width":50,"content":"T\u00ecm h\u1ed7n s\u1ed1 c\u1ee7a ph\u00e9p t\u00ednh sau:","type_input":"","ques":"<center><img src='img\/10.jpg' \/><\/center>Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c: $ D = 15 - 6\\dfrac{1}{3} + \\dfrac{2}{11} $; \u0110\u00e1p \u00e1n: _input_<br\/>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $ D = 15 - 6\\dfrac{1}{3} + \\dfrac{2}{11} $$ = 15 - \\dfrac{19}{3} + \\dfrac{2}{11} $$ = \\left( \\dfrac{45}{3} - \\dfrac{19}{3} \\right) + \\dfrac{2}{11} $$ = \\dfrac{26}{3} + \\dfrac{2}{11} $$ = \\dfrac{286}{33} + \\dfrac{6}{33} $$ = \\dfrac{292}{33} = 8\\dfrac{28}{33}$<br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 $8$ <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"89","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n k\u00ed t\u1ef1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ( >; =; < )","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u00ed t\u1ef1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ( >; =; < )","title_trans":"","temp":"fill_the_blank","correct":[[["="]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='img\/10.jpg' \/><\/center> So s\u00e1nh hai bi\u1ec3u th\u1ee9c sau: $ \\dfrac{3}{4} - 1\\dfrac{2}{5} $_input_$ \\dfrac{-2}{5} - \\dfrac{1}{4}$","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $\\dfrac{3}{4} - 1\\dfrac{2}{5} = \\dfrac{3}{4} - \\dfrac{7}{5} = \\dfrac{15}{20} - \\dfrac{28}{20} = \\dfrac{-13}{20} $ <br\/> $ \\dfrac{-2}{5} - \\dfrac{1}{4} = \\dfrac{-8}{20} - \\dfrac{5}{20} = \\dfrac{-13}{20}$ <br\/> <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0 d\u1ea5u = <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"},{"id":"90","post_id":"954","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n k\u00ed t\u1ef1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ( >; =; < )","options":{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u00ed t\u1ef1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng ( >; =; < )","title_trans":"","temp":"fill_the_blank","correct":[[[">"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='img\/10.jpg' \/><\/center> So s\u00e1nh hai bi\u1ec3u th\u1ee9c: $ \\dfrac{7}{3} + \\dfrac{3}{4} - \\dfrac{1}{5} $_input_$ \\dfrac{2}{3} + \\dfrac{-1}{4} + \\dfrac{2}{7}$","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b>* Quy t\u1eafc c\u1ed9ng, tr\u1eeb s\u1ed1 h\u1eefu t\u1ec9:<\/b> <br\/> \u0110\u01b0a v\u1ec1 d\u1ea1ng hai ph\u00e2n s\u1ed1 c\u00f3 c\u00f9ng m\u1eabu s\u1ed1 d\u01b0\u01a1ng r\u1ed3i \u00e1p d\u1ee5ng quy t\u1eafc c\u1ed9ng, tr\u1eeb ph\u00e2n s\u1ed1. <br\/> V\u1edbi $ x = \\dfrac{a}{m}, \\quad y = \\dfrac{b}{m} \\quad \\left( a,b,m \\in \\mathbb{Z}, m > 0 \\right), $ ta c\u00f3: <br\/> $x + y = \\dfrac{a}{m} + \\dfrac{b}{m} = \\dfrac{a+b}{m}$ <br\/> $x - y = \\dfrac{a}{m} - \\dfrac{b}{m} = \\dfrac{a-b}{m.}$ <br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> $ \\dfrac{7}{3} + \\dfrac{3}{4} - \\dfrac{1}{5} $$= \\dfrac{7}{3} + \\left( \\dfrac{15}{20} - \\dfrac{4}{20} \\right) $$= \\dfrac{7}{3} + \\dfrac{11}{20} $$= \\dfrac{140}{60} + \\dfrac{33}{60} = \\dfrac{173}{60}, $ <br\/> $ \\dfrac{2}{3} + \\dfrac{-1}{4} + \\dfrac{2}{7} $$= \\left( \\dfrac{8}{12} - \\dfrac{3}{12} \\right) + \\dfrac{2}{7} $$= \\dfrac{5}{12} + \\dfrac{2}{7} = \\dfrac{35}{84} + \\dfrac{24}{84} $$= \\dfrac{59}{84}$ <br\/> Do $\\dfrac{173}{60} > 1 > \\dfrac{59}{84}$ n\u00ean $ \\dfrac{7}{3} + \\dfrac{3}{4} - \\dfrac{1}{5} > \\dfrac{2}{3} + \\dfrac{-1}{4} + \\dfrac{2}{7}$ <br\/> <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0 > <\/span><\/span> <br\/>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:43"}]}